From 34c2414304d59e76d52b96efe6bebebb4e75f086 Mon Sep 17 00:00:00 2001 From: tchojnacki Date: Thu, 11 Aug 2022 12:01:44 +0200 Subject: Move year 2021 into a subfolder --- 2021-kotlin/src/Day07.kt | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 2021-kotlin/src/Day07.kt (limited to '2021-kotlin/src/Day07.kt') diff --git a/2021-kotlin/src/Day07.kt b/2021-kotlin/src/Day07.kt new file mode 100644 index 0000000..9c1b79f --- /dev/null +++ b/2021-kotlin/src/Day07.kt @@ -0,0 +1,27 @@ +import kotlin.math.absoluteValue + +object Day07 { + fun part1(input: String): Int { + val numbers = input.trim().split(",").map(String::toInt) + val range = numbers.minOrNull()!!..numbers.maxOrNull()!! + + return range.minOf { n -> numbers.sumOf { (it - n).absoluteValue } } + } + + fun part2(input: String): Int { + val numbers = input.trim().split(",").map(String::toInt) + val range = numbers.minOrNull()!!..numbers.maxOrNull()!! + + return range.minOf { n -> numbers.map { (it - n).absoluteValue }.sumOf { (it * (it + 1)) / 2 } } + } +} + +fun main() { + val testInput = readInputAsString("Day07_test") + check(Day07.part1(testInput) == 37) + check(Day07.part2(testInput) == 168) + + val input = readInputAsString("Day07") + println(Day07.part1(input)) + println(Day07.part2(input)) +} -- cgit v1.2.3